JP6983634B2 - Disc brake - Google Patents

Description

The present invention relates to a disc brake.

In a disc brake, a cylinder part that accommodates and projects the piston, a claw part that receives a reaction force against the pressing force generated by the piston, and a back meat part that connects the cylinder part and the claw part across the outside of the outer circumference of the rotor. (See, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-98848

It is desired to suppress the opening of at least one of the claw portion and the cylinder portion with respect to the bridge portion.

An object of the present invention is to provide a disc brake capable of suppressing the opening of at least one of a claw portion and a cylinder portion with respect to a bridge portion.

In order to achieve the above object, the present invention presents the present invention on both ends of at least one of the claw portion side and the cylinder portion side of the bridge portion in the disk circumferential direction, rather than the surfaces of the bridge portion along the disk axial direction. It is characterized by having a bulging portion protruding in the circumferential direction of the disc.

According to the present invention, it is possible to suppress the opening of at least one of the claw portion and the cylinder portion with respect to the bridge portion.

Sectional drawing which shows the disc brake of embodiment. The plan view which shows the disc brake of an embodiment. The front view which shows the disc brake of an embodiment. The perspective view which shows the disc brake of an embodiment. The perspective view which shows the disc brake of an embodiment. The side view which shows the disc brake of an embodiment. The side view which shows the disc brake of an embodiment.

The embodiments will be described below with reference to the drawings.

The disc brake 10 of the embodiment applies a braking force to a vehicle such as an automobile, and specifically, is for braking a four-wheeled automobile. As shown in FIG. 1, the disc brake 10 brakes the vehicle by stopping the rotation of the disc 11 that rotates together with the wheels (not shown). Hereinafter, the direction of the central axis of the disk 11 is referred to as the disk axis direction, the radial direction of the disk 11 is referred to as the disk radial direction, and the circumferential direction (rotational direction) of the disk is referred to as the disk circumferential direction.

The disc brake 10 includes a carrier 12, a pair of brake pads 13 and 14, a caliper 15, and a pair of pin boots 16 shown in FIG. The carrier 12 is arranged so as to straddle the outer peripheral side of the disc 11 and is fixed to the non-rotating portion of the vehicle. The pair of brake pads 13 and 14 shown in FIG. 1 are arranged on both sides of the disc 11 and are supported by the carrier 12 so as to be movable in the disc axial direction. The pair of brake pads 13 and 14 face each other on both sides of the disc 11. The caliper 15 is supported by the carrier 12 so as to be movable in the disc axial direction, and holds a pair of brake pads 13 and 14 and presses them on both sides of the disc 11.

The caliper 15 has a caliper body 20, a piston 21, a piston seal 22, a piston boot 23, and a pair of slide pins 24 shown in FIG.

The caliper body 20 is formed by processing a metal material integrally molded by casting. As shown in FIG. 1, the caliper body 20 is formed on the cylinder portion 26, the bridge portion 27 extending from the cylinder portion 26, and the extending tip side of the bridge portion 27, and is arranged to face the cylinder portion 26. It has a claw portion 28 to be formed, and a pair of arm portions 29 shown in FIG. 2 formed extending from the cylinder portion 26.

As shown in FIG. 1, the cylinder portion 26 is arranged to face one side of the disc 11 in the disk axial direction, and the bridge portion 27 straddles the outer periphery of the disc 11 from the outside of the cylinder portion 26 in the disc radial direction. It is extended. The claw portion 28 extends inward in the disc radial direction from the side of the bridge portion 27 opposite to the cylinder portion 26, and is arranged to face the other side of the disc 11 in the disc axial direction. As shown in FIG. 2, the pair of arm portions 29 extend from the cylinder portion 26 to both sides in the circumferential direction of the disc.

The caliper body 20 is movably supported by the carrier 12 along the disk axial direction by slide pins 24 attached to the pair of arm portions 29. The pair of pin boots 16 covers the portion of the slide pin 24 that is in sliding contact with the carrier 12.

As shown in FIG. 3, on the claw portion 28 of the caliper body 20, recesses 100 recessed from the edge portion on the inner side in the disc radial direction to the outer side in the disc radial direction are formed in two places arranged in the circumferential direction of the disc.

As shown in FIG. 2, the bridge portion 27 of the caliper body 20 is formed with a pair of substantially flat surface portions 101 and 102 along the disk axial direction on both sides in the disk circumferential direction. In other words, these surface portions 101 and 102 face both outer sides in the circumferential direction of the disk in the bridge portion 27. These surface portions 101 and 102 are along the radial reference line passing through the center of the bridge portion 27 and the caliper body 20 in the circumferential direction of the disc perpendicular to the central axis of the disc 11, and are substantially parallel to each other.

The bridge portion 27 protrudes outward from the pair of face portions 101 and 102 toward the claw portion 28 side in the disc axial direction of the bridge main body portion 110 having the pair of face portions 101 and 102 and the pair of face portions 101 and 102. It is provided with a pair of claw-side bulging portions 111, 112 (bulging portions) provided. In other words, the bridge portion 27 is built up so that the claw portion 28 side of the pair of surface portions 101 and 102 in the disc axial direction rises outward in the disc circumferential direction.

As shown in FIG. 4, on the claw portion 28 side in the disk axial direction of one surface portion 101 of the bridge main body portion 110, one claw portion side bulging portion 111 projecting outward from the one surface portion 101 in the disk circumferential direction is provided. As shown in FIG. 5, the bridge main body 110 is provided on the claw portion 28 side in the disk axial direction of the other surface portion 102, and the other claw portion side protruding outward from the other surface portion 102 in the disk circumferential direction. A bulge 112 is provided. The pair of claw-side bulging portions 111 and 112 are formed at both ends of the bridge portion 27 in the circumferential direction of the disk.

As shown in FIGS. 6 and 7, the pair of claw-side bulging portions 111 and 112 are arranged in the boundary region of the bridge portion 27 with the claw portion 28, and the positions of the claw portion 28 and the disc axial direction are arranged. It is superposed. The pair of claw-side bulging portions 111 and 112 are formed on the caliper body 20 separately from the pair of arm portions 29 to which the slide pins 24 slidably supported by the carrier 12 are attached.

As shown in FIGS. 115 is formed. As shown in FIGS. 2 to 5, no recess is formed in the other claw side bulge 112 of the pair of claw side bulges 111, 112, and the claw in the bridge main body 110 is formed. A recess 116 recessed from the outside to the inside in the radial direction of the disk is formed in the vicinity of the portion-side bulging portion 112.

As shown in FIGS. 2 to 4, the recess 115 is formed over both the claw-side bulging portion 111 and the bridge main body portion 110. The recess 115 includes a bottom surface 121 extending in a plane orthogonal to the radial reference line, a wall surface 122 rising along the radial reference line from the edge portion of the bottom surface 121 on the cylinder portion 26 side in the disk axial direction, and a bottom surface 121. It has a wall surface 123 that rises along the radial reference line from the edge portion on the radial reference line side in the circumferential direction of the disk. The wall surface 122 is along the circumferential direction of the disc, and the wall surface 123 is along the axial direction of the disc.

The bottom surface 121 has an edge portion excluding the wall surface 122 side and the wall surface 123 side, which faces the outside of the caliper body 20. The wall surface 122 has an edge portion excluding the bottom surface 121 side and the wall surface 123 side, which faces the outside of the caliper body 20. The wall surface 123 has an edge portion excluding the bottom surface 121 side and the wall surface 122 side, which faces the outside of the caliper body 20.

The bottom surface 121 and the wall surface 122 of the recess 115 are formed over both the claw-side bulging portion 111 and the bridge main body portion 110, and the wall surface 123 is formed entirely on the bridge main body portion 110. As shown in FIG. 6, the recess 115 also overlaps the claw portion 28 with the position in the disk axial direction.

As shown in FIGS. 2 to 5, the recess 116 is entirely formed in the bridge main body 110. In other words, the recess 116 is not formed in the claw-side bulge 112 in the vicinity thereof. As shown in FIG. 3, the recesses 116 are a pair of bottom surfaces 131 and 132 that are inclined with respect to the radial reference line and are recessed inward in a V shape in the radial direction of the disk, and the disk shafts of the bottom surfaces 131 and 132 as shown in FIG. The wall surface 133 rising from both end edges on the cylinder portion 26 side in the direction along the radial reference line, and the end edge portion on the radial reference line side of one of the bottom surfaces 132 in the radial direction as shown in FIG. It has a wall surface 134 that rises along a reference line. The bottom surfaces 131 and 132 are along the disc axial direction, the wall surface 133 is along the disc circumferential direction, and the wall surface 134 is along the disc axial direction.

The bottom surface 131 has end edges facing the outside of the caliper body 20 except for the bottom surface 132 side and the wall surface 133 side. The bottom surface 132 has end edges facing the outside of the caliper body 20 except for the bottom surface 131 side, the wall surface 133 side, and the wall surface 134 side. The wall surface 133 has end edges facing the outside of the caliper body 20 except for the bottom surface 131 side, the bottom surface 132 side, and the wall surface 134 side. The wall surface 134 has an edge portion excluding the bottom surface 132 side and the wall surface 133 side, which faces the outside of the caliper body 20. As shown in FIG. 7, the recess 116 also overlaps the position of the claw portion 28 in the disk axial direction.

Further, as shown in FIG. 2, the bridge portion 27 has a pair of mirror plane symmetries protruding outward from the pair of surface portions 101 and 102 on the cylinder portion 26 side in the disk axial direction of the pair of surface portions 101 and 102. The cylinder portion side bulging portion 141, 142 (bulging portion) of the above is provided. In other words, the bridge portion 27 is built up so that the cylinder portion 26 side of the pair of surface portions 101 and 102 in the disk axial direction rises outward in the disk circumferential direction. The pair of cylinder-side bulging portions 141 and 142 are also formed on the caliper body 20 separately from the pair of arm portions 29 to which the slide pins 24 slidably supported by the carrier 12 are attached.

As shown in FIG. 4, on the cylinder portion 26 side of one surface portion 101 of the bridge main body portion 110 in the disk axial direction, one cylinder portion side bulging portion 141 projecting outward from the one surface portion 101 in the disk circumferential direction is provided. As shown in FIG. 5, the other surface portion 102 of the bridge main body portion 110 is provided on the cylinder portion 26 side in the disk axial direction, and the other cylinder portion side that protrudes outward from the other surface portion 102 in the disk circumferential direction. A bulge 142 is provided. The pair of cylinder-side bulging portions 141 and 142 are formed at both ends of the bridge portion 27 in the circumferential direction of the disk.

As shown in FIGS. 6 and 7, the pair of cylinder-side bulging portions 141 and 142 are arranged in the vicinity of the boundary region between the bridge portion 27 and the cylinder portion 26, and are located at positions of the cylinder portion 26 and the disk axial direction. Are superposed.

As shown in FIGS. 2, 4 to 7, the pair of cylinder-side bulging portions 141 and 142 are formed with a pair of recesses 145 and 146 that are recessed from the outside to the inside in the radial direction of the disk. That is, a recess 145 is formed in the bulging portion 141 on the cylinder portion side, and a recess 146 is formed in the bulging portion 142 on the cylinder portion side.

As shown in FIGS. 2 and 4, the recess 145 is formed over both the cylinder portion side bulging portion 141 and the bridge main body portion 110, and the recess 146 is mirror-symmetrical with the recess 145 and is shown in FIG. 2. As shown in FIG. 5, it is formed over both the cylinder portion side bulging portion 142 and the bridge main body portion 110.

As shown in FIGS. 2 and 6, the recess 145 has a bottom surface 151 extending in a plane orthogonal to the radial reference line and a radial reference line from the edge portion of the bottom surface 151 on the claw portion 28 side in the disk axis direction. It has a wall surface 152 that rises along the radial reference line, and a wall surface 153 that rises along the radial reference line from the edge portion of the bottom surface 151 on the radial reference line side in the circumferential direction. The wall surface 152 is along the circumferential direction of the disc, and the wall surface 153 is along the axial direction of the disc.

The bottom surface 151 is an edge portion whose edge portion excluding the wall surface 152 side and the wall surface 153 side faces the outside of the caliper body 20. The wall surface 152 has an edge portion excluding the bottom surface 151 side and the wall surface 153 side, which faces the outside of the caliper body 20. The wall surface 153 has an edge portion excluding the bottom surface 151 side and the wall surface 152 side, which faces the outside of the caliper body 20.

The bottom surface 151 and the wall surface 152 of the recess 145 are formed over both the cylinder portion side bulging portion 141 and the bridge main body portion 110, and the entire wall surface 153 is formed on the bridge main body portion 110. As shown in FIG. 6, the recess 145 also overlaps the cylinder portion 26 with the position in the disk axial direction.

As shown in FIGS. 2 and 7, the recess 146 has a bottom surface 161 extending in a plane orthogonal to the radial reference line and a radial reference line from the edge portion of the bottom surface 161 on the claw portion 28 side in the disk axis direction. It has a wall surface 162 that rises along the radial reference line, and a wall surface 163 that rises along the radial reference line from the edge portion of the bottom surface 161 on the radial reference line side in the circumferential direction. The wall surface 162 is along the circumferential direction of the disc, and the wall surface 163 is along the axial direction of the disc.

The bottom surface 161 has an edge portion excluding the wall surface 162 side and the wall surface 163 side, which faces the outside of the caliper body 20. The wall surface 162 has end edges facing the outside of the caliper body 20 except for the bottom surface 161 side and the wall surface 163 side. The wall surface 163 has an edge portion excluding the bottom surface 161 side and the wall surface 162 side, which faces the outside of the caliper body 20.

The bottom surface 161 and the wall surface 162 of the recess 146 are formed over both the cylinder portion side bulging portion 142 and the bridge main body portion 110, and the entire wall surface 163 is formed on the bridge main body portion 110. As shown in FIG. 7, the recess 146 also overlaps the cylinder portion 26 with the position in the disk axial direction. The bottom surface 151 and the bottom surface 161 are arranged on the same plane.

As shown in FIG. 1, the cylinder portion 26 has a cylinder hole 35 having a shape in which one end is opened toward the claw portion 28 side and the cylinder portion 26 is recessed toward the side opposite to the disc 11 in the disc axial direction. The cylinder portion 26 is provided with a plurality of cylinder holes 35, specifically, two locations (only one location is shown in FIG. 1 due to the cross section). These cylinder holes 35 have the same shape, and are provided side by side in the disk circumferential direction by aligning the positions in the disk axial direction and the disk radial direction and shifting the positions in the disk circumferential direction.

By forming a plurality of cylinder holes 35 that open toward the claw portion 28 side, the cylinder portion 26 has a cylinder bottom portion including the inner bottom portions 38 of each of the plurality of cylinder holes 35 on the side opposite to the claw portion 28. It has a cylinder portion 42 extending from the cylinder bottom portion 39 toward the claw portion 28 and including an inner wall 41 of each of the plurality of cylinder holes 35. The cylinder hole 35 has an opening 43 on the side of the inner wall 41 opposite to the cylinder bottom 39. The opening 43 is also the opening of the cylinder portion 26.

A piston 21 that presses the brake pads 13 and 14 against the disc 11 is inserted into the cylinder hole 35 so as to be slidable in the disc axial direction. The inner wall inner peripheral surface portion 50 of the inner wall 41 of the cylinder portion 26 has a guide inner peripheral surface portion 51 which is a cylindrical surface having a constant inner diameter over the entire length to guide the movement of the piston 21.

The inner wall 41 of the cylinder hole 35 has an annular large-diameter groove 52 recessed outward in the radial direction of the cylinder hole 35 from the guide inner peripheral surface portion 51 on the cylinder bottom 39 side of the guide inner peripheral surface portion 51. There is. The inner wall 41 of the cylinder hole 35 has an annular seal groove 55 recessed outward in the radial direction of the cylinder hole 35 from the guide inner peripheral surface portion 51 at an intermediate position on the opening 43 side of the guide inner peripheral surface portion 51. There is. The inner wall 41 of the cylinder hole 35 is formed with an annular step portion 60 recessed outward in the radial direction of the cylinder hole 35 from the guide inner peripheral surface portion 51 on the opening 43 side of the seal groove 55.

The large-diameter groove 52 and the inner bottom portion 38 connected to the large-diameter groove 52 are cast during casting of the material of the caliper body 20, and the guide inner peripheral surface portion 51, the seal groove 55 and the step portion 60 are cylinder holes of the material of the caliper body 20. The prepared hole of 35 is formed by cutting. One recess 100 of the claw portion 28 overlaps the position of one cylinder hole 35 in the disc radial direction and the disk circumferential direction, and the other recess 100 overlaps the other cylinder hole 35 in the disc radial direction and the disk circumferential direction. The positions of are overlapped. A cutting tool is inserted into the pair of cylinder holes 35 via these recesses 100.

The bottom of the cylinder 39 is formed with a piping hole (not shown) that penetrates along the axial direction of the cylinder hole 35 so as to open into the cylinder hole 35. The piping hole is formed by cutting the material of the caliper body 20. A brake pipe (not shown) is connected to the pipe hole.

The piston 21 includes a disk-shaped piston bottom 71 and a cylindrical piston body 72. The piston 21 is formed in the shape of a bottomed cylinder in which the end of the piston body 72 opposite to the piston bottom 71 is opened. The piston body portion 72 has an outer diameter surface 74 formed of a cylindrical surface. The piston body portion 72 is formed on the tip end side opposite to the piston bottom portion 71 with an annular fitting groove 75 recessed inward in the radial direction from the outer diameter surface 74 formed of a cylindrical surface over the entire circumference.

The piston 21 is housed in the cylinder hole 35 so that the piston bottom 71 is located on the cylinder bottom 39 side in the cylinder hole 35, and in this state, the tip on the claw portion 28 side is the claw portion 28 rather than the cylinder hole 35. Protruding to the side. The piston 21 is formed with a fitting groove 75 on the tip end side protruding from the guide inner peripheral surface portion 51 of the cylinder hole 35.

The piston seal 22 is made of an elastic material, specifically rubber, and is fitted into the seal groove 55 of the cylinder hole 35 with a tightening margin. The piston 21 is fitted to the inner peripheral side of the piston seal 22 with a tightening allowance. The piston seal 22 elastically deforms in the radial direction and comes into close contact with the outer diameter surface 74 of the piston 21 and the seal groove 55 to seal between the cylinder hole 35 of the cylinder portion 26 and the piston 21. Further, the piston seal 22 supports the outer diameter surface 74 of the piston 21 so as to be movable in the axial direction of the cylinder hole 35 with the guide inner peripheral surface portion 51 of the cylinder hole 35. The piston seal 22 forms a hydraulic chamber 78 with the cylinder hole 35 and the piston 21, and supplies and discharges the brake fluid to the hydraulic chamber 78 via a brake pipe connected to a piping hole (not shown). Is done.

The piston boot 23 is a stretchable tubular body, and is formed on a bellows-shaped telescopic portion 81, an annular fixing portion 82 formed on one end side of the telescopic portion 81, and an annular fixing portion 82 formed on the other end side of the telescopic portion 81. It has an annular fitting portion 83 and. In the piston boot 23, the fixing portion 82 at one end is fitted and fixed to the step portion 60 of the cylinder portion 26, and the fitting portion 83 at the other end is fitted and fixed to the fitting groove 75 of the piston 21. In this state, the piston boot 23 covers the portion of the outer diameter surface 74 on the piston bottom 71 side of the fitting groove 75 of the piston 21 that protrudes from the guide inner peripheral surface portion 51, and moves the piston 21 with respect to the cylinder hole 35. The expansion / contraction portion 81 expands / contracts accordingly.

When the brake pedal (not shown) is operated, the disc brake 10 introduces the brake fluid into the hydraulic chamber 78 via the brake pipe (not shown) connected to the piping hole (not shown). Then, the brake fluid pressure acts on the piston bottom 71 of the piston 21 in the direction away from the cylinder bottom 39. As a result, the piston 21 advances toward the disc 11 with respect to the cylinder hole 35, and presses the brake pad 13 arranged between the piston 21 and the disc 11 toward the disc 11. As a result, the brake pad 13 moves and comes into contact with the disc 11.

Further, the caliper body 20 slides against the carrier 12 on the pair of slide pins 24 by the reaction force that presses the brake pad 13 against the disc 11, and the claw portion 28 is placed between the claw portion 28 and the disc 11. The arranged brake pad 14 is pressed toward the disc 11. As a result, the brake pad 14 comes into contact with the disc 11. In this way, the caliper 15 sandwiches the pair of brake pads 13 and 14 from both sides between the piston 21 and the claw portion 28 by the operation of the piston 21 and presses them against both sides of the disc 11. As a result, the caliper 15 imparts frictional resistance to the disc 11 to generate braking force.

The disc brake described in Patent Document 1 described above has a cylinder portion that accommodates and projects a piston, a claw portion that receives a reaction force against a pressing force generated by the piston, and a cylinder portion and a claw portion that straddle the outside of the outer circumference of the rotor. It has a back meat part to connect with. By the way, in a disc brake, a pair of brake pads are sandwiched between a piston and a claw portion from both sides and pressed against both sides of the disc during braking. At this time, a force is applied between the bridge portion and the claw portion and between the bridge portion and the cylinder portion in a direction in which the angle formed by each other increases, which may cause an opening that deforms in this direction. There is sex. When such an opening occurs, the transmission efficiency of the pressing force of the piston decreases, so that it is necessary to form the caliper body in a large size in consideration of this decrease, and the disc brake becomes large. Further, when this opening occurs, the pad contact surface of the claw portion and the opening surface of the cylinder portion are tilted with respect to the pressed surface of the disc. Therefore, when the brake pad is pressed against the disc in a state where the opening is generated, the wear of the radial outer portion of the lining is promoted more than the inner portion in the radial direction of the disc, and so-called uneven wear of the brake pad occurs.

On the other hand, the disc brake 10 of the embodiment projects at both ends of the bridge portion 27 on the claw portion 28 side in the disc circumferential direction from the surface portions 101 and 102 along the disc axial direction of the bridge portion 27 in the disc circumferential direction. Since the claw side bulging portions 111 and 112 are formed, the rigidity between the bridge portion 27 and the claw portion 28 becomes high, which has conventionally occurred between the bridge portion 27 and the claw portion 28 during braking. The opening can be suppressed. Further, at both ends of the bridge portion 27 on the cylinder portion 26 side in the disk circumferential direction, cylinder portion side bulging portions 141 and 142 protruding in the disc circumferential direction from the surface portions 101 and 102 along the disk axial direction of the bridge portion 27 are provided. Since it is formed, the rigidity between the bridge portion 27 and the cylinder portion 26 becomes high, and it is possible to suppress the opening that has conventionally occurred between the bridge portion 27 and the cylinder portion 26 during braking.

Further, a recess 115 recessed from the outside in the radial direction of the disk to the inside is formed from the bridge body 110 and the claw-side bulging 111 projecting from the bridge body 110 in the circumferential direction of the disk. In 115, the length in the circumferential direction of the disc is increased by the amount that the bottom surface 121 extending in the plane orthogonal to the radial reference line is formed in the claw side bulging portion 111. In addition, a recess 145 recessed from the outside in the radial direction of the disk to the inside is formed from the bridge body 110 and the bulging portion 141 on the cylinder portion side protruding from the bridge body 110 in the circumferential direction of the disk. As for the recess 145, the length in the circumferential direction of the disk is increased by the amount that the bottom surface 151 extending in the plane orthogonal to the radial reference line is formed in the cylinder portion side bulging portion 141. In addition, a recess 146 recessed from the outside to the inside in the radial direction of the disk is formed from the bridge body 110 and the bulging portion 142 on the cylinder portion side protruding from the bridge body 110 in the circumferential direction of the disk. The recess 146 also has a longer disk circumferential length because the bottom surface 161 extending in the plane orthogonal to the radial reference line is formed in the cylinder portion side bulging portion 142.

Therefore, for example, when the processing machine supports the caliper body 20 including the three points of the bottom surfaces 121, 151, 161 for processing, these support points are shifted to the outside in the disk circumferential direction from the bridge main body 110. Can also support the caliper body 20. Therefore, when processing with the same processing machine as another caliper body having a bridge portion wider in the disk circumferential direction than the bridge main body 110, the caliper body 20 and the other caliper body are supported by a common support point. It is possible to make it. Therefore, in the processing machine, it is not necessary to change the support points at least at these three points, and the man-hours required for the setup change between the caliper body 20 and the other caliper body can be reduced. In this way, even if the support points during processing are shared with other caliper bodies having a bridge portion wider in the disk circumferential direction than the bridge main body 110, the weight increase of the caliper body 20 is on the claw portion side. Only the amount of the bulging portions 111 and 112 and the bulging portions 141 and 142 on the cylinder portion side can be suppressed, and the weight increase can be suppressed.

Here, the disc brake 10 of the embodiment is located at both ends of the bridge portion 27 on both the claw portion 28 side and the cylinder portion 26 side in the disc circumferential direction, rather than the surface portions 101 and 102 along the disc axial direction of the bridge portion 27. Although the claw side bulging portions 111 and 112 and the cylinder portion side bulging portions 141 and 142 protruding in the disk circumferential direction are provided, only the claw portion side bulging portions 111 and 112 may be provided, and the cylinder portion may be provided. Only the side bulges 141 and 142 may be provided. That is, at least one of the claw portion 28 side and the cylinder portion 26 side of the bridge portion 27 has bulges protruding in the disc circumferential direction from the surface portion along the disc axial direction of the bridge portion at both ends in the disc circumferential direction. It suffices to have a part.

The first aspect of the disc brake of the above-described embodiment is a cylinder portion having a cylinder hole into which a piston for pressing a brake pad is inserted into the disc, a bridge portion extending from the cylinder portion, and a bridge portion. In a disc brake having a claw portion formed on the extension tip side of the bridge portion and arranged to face the cylinder portion, at least one of the claw portion side and the cylinder portion side of the bridge portion. Both ends of the disc circumferential direction are provided with bulging portions that protrude in the disc circumferential direction from the surface portions of the bridge portion along the disc axial direction. This makes it possible to suppress the opening of at least one of the claw portion and the cylinder portion with respect to the bridge portion.

In the second aspect, in the first aspect, the bulging portion is formed with a recess recessed from the outside in the radial direction of the disc toward the inside.

In the third aspect, in the first aspect, a recess is formed at a position overlapping the bulging portion in the disk axial direction and adjacent to the disk circumferential direction from the outside to the inside in the disc radial direction. Has been done.

10 Disc brake 11 Disc 13,14 Brake pad 21 Piston 26 Cylinder part 27 Bridge part 28 Claw part 35 Cylinder hole 111,112 Cylinder side bulging part (bulging part)
115,145,146 Recesses 141,142 Cylinder side bulging part (bulging part)

Claims (1)

A cylinder with a cylinder hole into which the piston that presses the brake pad is inserted into the disc,
A bridge portion formed by extending from the cylinder portion and
A claw portion formed on the extension tip side of the bridge portion and arranged to face the cylinder portion, and a claw portion.
In disc brakes with
A pair of cylinder-side bulging portions protruding in the disk circumferential direction from the surface portion of the bridge portion along the disk axial direction at both ends of the bridge portion on the cylinder portion side in the disk circumferential direction, and the bridge portion. The pair of cylinder-side bulging portions provided in the boundary region with the cylinder portion and provided at a position where the position of the bridge portion in the disk axial direction overlaps with the cylinder portion.
A pair of claw-side bulging portions that protrude in the disc circumferential direction from the surface portion of the bridge portion along the disk axial direction at both ends of the bridge portion on the claw portion side in the disc circumferential direction. The pair of claw-side bulging portions provided in the boundary region with the claw portion and at a position where the position of the bridge portion in the disk axial direction overlaps with the claw portion.
Equipped with a,
The pair of cylinder-side bulges are provided with a pair of cylinder-side recesses recessed from the outside to the inside in the radial direction of the disc.
A disc brake characterized in that at least one of the pair of claw-side bulges is provided with a claw-side recess that is recessed from the outside to the inside in the radial direction of the disc.

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